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dm: fix limits initialization when there are no data devices 

dm_calculate_queue_limits will first reset the provided limits to
defaults using blk_set_stacking_limits; whereby defeating the purpose of
retaining the original live table's limits -- as was intended via commit
3ae7065616 ("dm: retain table limits when
swapping to new table with no devices").

Fix this improper limits initialization (in the no data devices case) by
avoiding the call to dm_calculate_queue_limits.

[patch header revised by Mike Snitzer]

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # v3.6+
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Christie 2013-03-01 22:45:48 +00:00 committed by Alasdair G Kergon
parent 23cb21092e
commit 87eb5b21d9
1 changed files with 7 additions and 5 deletions
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12
drivers/md/dm.c
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@ -2446,7 +2446,7 @@ static void dm_queue_flush(struct mapped_device *md)
*/
struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
{
struct dm_table *live_map, *map = ERR_PTR(-EINVAL);
struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL);
struct queue_limits limits;
int r;
@ -2469,10 +2469,12 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
dm_table_put(live_map);
}
r = dm_calculate_queue_limits(table, &limits);
if (r) {
map = ERR_PTR(r);
goto out;
if (!live_map) {
r = dm_calculate_queue_limits(table, &limits);
if (r) {
map = ERR_PTR(r);
goto out;
}
}
map = __bind(md, table, &limits);